JP3767956B2 - One can two water bath hot water heater - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a canned two-way bath water heater in which a hot water supply heat exchanger and a reheating heat exchanger are integrated, and the integrated heat exchanger is heated by a common burner.
[0002]
[Prior art]
FIG. 3 shows a system configuration example of a one-can two-water bath water heater developed by the applicants. In the figure, this single can two water bath water heater (equipment) has a combustion chamber 1, a burner 2 is disposed in the combustion chamber 1, and a hot water supply heat exchanger 3 and a follower are disposed above the burner 2. A soaking heat exchanger 4 is provided. These hot water supply heat exchangers 3 and reheating heat exchangers 4 are integrated. That is, a hot water supply side pipe line is inserted through a plurality of common fin plates 5 to form a hot water supply heat exchanger 3, and a reheating side pipe line is similarly inserted through the fin plate 5. Reheating The heat exchanger 4 is configured, and the burner 2 is configured to heat both the hot water supply heat exchanger 3 and the reheating heat exchanger 4.
[0003]
The combustion chamber 1 on the lower side of the burner 2 communicates with an air supply passage 6, and a combustion fan 7 is incorporated in the air supply passage 6. Then, air is sent to the burner 2 and exhaust gas generated by the combustion of the burner 2 is discharged to the outside from the exhaust passage 9 communicating with the combustion chamber 1 above the burner 2.
[0004]
A gas nozzle 19 is disposed opposite to the gas inlet of the burner 2, and a gas supply passage 8 for introducing fuel gas is connected to the gas nozzle 19, and the fuel gas introduced by the gas supply passage 8 is connected to the gas nozzle 19. Is supplied to the burner 2 via the gas nozzle 19. The gas supply passage 8 is provided with electromagnetic valves 10, 11a, 11b for opening and closing the passage, and a proportional valve 12 for controlling the gas supply amount by the valve opening amount.
[0005]
One end side of the water supply passage 13 is connected to the inlet side of the hot water supply heat exchanger 3, one end side of the hot water supply passage 14 is connected to the outlet side of the hot water supply heat exchanger 3, and the other end side of the water supply passage 13 is It is connected to a water supply source through an external pipe, and the other end of the hot water supply passage 14 is led to a desired hot water supply place such as a kitchen through the external pipe. Further, a bypass passage 15 and a bypass passage 16 are provided to short-circuit the water supply passage 13 on the inlet side and the hot water supply passage 14 on the outlet side of the hot water supply heat exchanger 3, and the bypass passage 16 is opened and closed. An electromagnetic valve 17 is interposed.
[0006]
One end of a pipe 18 is connected to the inlet side of the reheating heat exchanger 4, and the other end of the pipe 18 is connected to the discharge port of the circulation pump 20. One end side of the return pipe 21 is connected, and the other end side of the return pipe 21 is connected to the bathtub 22. In addition, one end side of a pipe line 23 is connected to the outlet side of the reheating heat exchanger 4, and the other end side of the pipe line 23 is connected to the bathtub 22. The return pipe 21, the pipe 18, the reheating heat exchanger 4, and the line 23 constitute a recirculation circulation path 24.
[0007]
The pipe 18 of the recirculation circulation passage 24 and the hot water supply passage 14 are communicated with each other by a hot water filling passage 25, and the hot water filling passage 25 has a pouring control valve 26 for controlling the opening and closing of the passage, and the water level of the bathtub 22. And a water level sensor 28 that detects water pressure by water pressure.
[0008]
In the figure, 30 is an air volume sensor that detects the air volume in the combustion chamber 1, 31 is a water volume sensor that is provided in the water supply passage 13 and detects the flow rate of the water supply, and 32 is water in the water supply passage 13. A water temperature sensor for detecting temperature, 34 is a flow rate control valve that is provided in the hot water supply passage 14 to control the flow rate of hot water supply, and 35 is provided in the hot water supply passage 14 to indicate that hot water is being supplied. A hot water supply confirmation switch to be detected, 36 is a water flow sensor for detecting the water flow in the recirculation circulation passage 24, and 37 is a recirculation circulation passage for detecting the hot water in the recirculation circulation passage 24 as a bath water temperature (bath temperature). A bath temperature sensor, which is a temperature sensor, is a hot water temperature sensor 38 that detects the temperature of hot water produced by the hot water supply heat exchanger 3.
[0009]
A control device 40 is provided in the single can two water bath hot water heater, and a remote controller 41 is connected to the control device 40. The remote controller 41 includes a hot water supply temperature setting means for setting the hot water supply temperature, a bath temperature setting means for setting the bath temperature of the bathtub 22, a bath water level setting means for setting the hot water level of the bathtub 22, and the bathtub 22. An automatic operation button for starting automatic operation of a series of baths from hot water filling to heat insulation is provided.
[0010]
The control device 40 takes in sensor output signals of various sensors and information from the remote controller 41, and controls operations in various operation modes such as hot water supply operation and automatic bath operation in accordance with a sequence program given in advance as follows. To do.
[0011]
For example, when a faucet of a hot water supply passage led to a kitchen or the like is opened, water flows into the water supply passage 13 from a water supply source, and the water amount sensor 31 detects water passing through the water supply passage 13, the appliance operates in the hot water supply mode. Start. First, the rotational drive of the combustion fan 7 is started, and both or one of the solenoid valves 11a and 11b and the solenoid valve 10 are opened to supply the fuel gas to the burner 2 through the gas supply passage 8, which is not shown. The burner 2 is ignited by ignition means to start combustion.
[0012]
Then, the amount of combustion heat of the burner 2 is controlled by controlling the valve opening amount of the proportional valve 12 (controlling the amount of gas supplied to the burner 2) so that the hot water temperature becomes the hot water set hot water temperature set in the remote controller 41. The hot water supply heat exchanger 3 is heated by the combustion flame of the burner 2 to produce hot water at a set temperature, and this hot water is supplied to the hot water supply place through the hot water supply passage 14.
[0013]
When the use of hot water is finished and the faucet is closed, water flow to the hot water supply heat exchanger 3 is stopped, and the electromagnetic valve 10 is closed when the water amount sensor 31 no longer detects water flow through the water supply passage 13. The combustion of the burner 2 is stopped. Thereafter, when a predetermined post-purge period (for example, 5 minutes) elapses, the rotation drive of the combustion fan 7 is stopped, the operation in the hot water supply mode is terminated, and the next hot water supply is prepared.
[0014]
When the automatic operation button of the remote controller 41 is used to instruct the automatic operation of the bath, first, the operation in the hot water filling mode is started as shown in step 101 of the flowchart of FIG. For example, when the pouring control valve 26 is opened and when the pouring control valve 26 is opened, water flows from the water supply source into the water supply passage 13 and the water amount sensor 31 detects the water flow through the water supply passage 13. The combustion of the burner 2 is started similarly to the operation.
[0015]
Hot water produced in the hot water supply heat exchanger 3 by the combustion flame of the burner 2 is sent to the recirculation circulation passage 24 through the hot water supply passage 14 and the hot water filling passage 25 in order, and the hot water flowing into the recirculation circulation passage 24 returns. It is dropped into the bathtub 22 by two paths, a path passing through the pipe 21 and a path passing through the reheating heat exchanger 4. When the water level of the bathtub 22 detected by the water level sensor 28 reaches the set water level set in the remote controller 41, the hot water control valve 26 is closed and the solenoid valve 10 is closed to stop the combustion of the burner 2 to fill the hot water. End mode operation.
[0016]
After the operation of the hot water filling mode is completed, as shown in step 102 of FIG. 4, the circulation pump 20 is driven to recirculate hot water in the bathtub 22 and circulate it through the circulation passage 24 to stir the hot water in the bathtub 22. Then, the bath temperature of the bathtub 22 is detected by the bath temperature sensor 37. In step 104, it is determined whether or not the detected bath temperature Th is lower than the set temperature Ts of the bath. The bath temperature Th is lower than the set temperature Ts. When it is determined that the value is low, the process proceeds to step 110, and the operation in the chase mode is started.
[0017]
For example, the circulation pump 20 is continuously driven to recirculate hot water in the bathtub 22 through the recirculation circulation passage 24 and start combustion of the burner 2, and the reheating heat exchanger 4 is driven by the combustion flame of the burner 2. The circulating hot water is heated and reheated. When it is determined in step 104 that the bath temperature Th detected by the bath temperature sensor 37 has reached the set temperature Ts, the combustion of the burner 2 is stopped and the operation in the reheating mode is ended.
[0018]
And as shown to step 105, while stopping the circulation pump 20, the time measurement by the timer incorporated in the control apparatus 40 is started, and operation | movement of a heat retention mode is started.
[0019]
For example, as shown in step 106, it is determined whether or not the measurement time tc of the timer has reached a predetermined set time ts (for example, 30 minutes). When it is determined that the measurement time tc has reached the set time ts, the operation from step 102 to step 105 is performed, and when the bath temperature Th is lower than the set temperature Ts, retreat is performed. Thus, the bath temperature Th can be maintained at the set temperature Ts.
[0020]
Further, during the period in which it is determined in step 106 that the timer measurement time tc has not reached the set time ts, the water retention mode operation shown in steps 107, 108, and 109 is performed.
[0021]
First, in step 107, the sensor output of the water level sensor 28 is captured. The water level sensor 28 detects the water pressure of the hot water in the hot water passage 25 as the water pressure of the bathtub 22 and outputs the water pressure of the bathtub water level as a sensor output. PQ data as shown by the solid line A in FIG. 5 representing the relationship between the sensor output (P) detected by the water level sensor 28 and the amount of water (Q) in the bathtub 22 is obtained and given to the control device 40 in advance. The water level of the bathtub 22 is detected by referring to the PQ data with respect to the sensor output of the water level sensor 28.
[0022]
When it is determined in step 108 whether or not the detected water level Pk of the bathtub 22 is lower than the set water level Ps, and it is determined that the water level Pk of the bathtub 22 is not lower than the set water level Ps. When the water level detection operation by the water level sensor 28 is repeated by the operation after the step 106, and when it is determined that the water level Pk of the bathtub 22 is lower than the set water level Ps due to the use of hot water by the bather, etc. In Step 109, the hot water filling operation is started, the hot water is poured into the bathtub 22, and the water level Pk of the bathtub 22 is raised to the set water level Ps.
[0023]
The operation in the water retention mode is repeatedly performed until the measurement time tc of the timer reaches the set time ts.
[0024]
The operation in the heat retention mode including the water retention operation is performed over a predetermined period (for example, for 4 hours after the bath has boiled up).
[0025]
As described above, the single can two water bath hot water heater is a system in which the integrated hot water supply heat exchanger 3 and the reheating heat exchanger 4 are heated by using the common burner 2, and thus are provided separately. Compared with the method in which the hot water supply heat exchanger and the reheating heat exchanger are each heated by combustion using separate burners, the configuration of the apparatus can be simplified, and as a result, the apparatus can be downsized and the cost can be reduced. Become.
[0026]
[Problems to be solved by the invention]
By the way, if the single-can two-water bath water heater does not perform the reheating operation and performs the hot water supply single operation only with the hot water supply, an accurate water level of the bathtub 22 cannot be obtained immediately after the hot water supply single operation for the following reasons. It was found by the applicant's experiment.
[0027]
During the hot water supply single operation, hot water remains in the reheating heat exchanger 4 and when the burner 2 is burned for the hot water operation, not only the hot water heat exchanger 3 but also the hot water heat exchanger 3 is driven by the combustion flame of the burner 2. Since the soaking heat exchanger 4 is also heated, the staying hot water in the reheating heat exchanger 4 is heated. For this reason, the temperature of the stagnant hot water in the reheating heat exchanger 4 rises to a state close to boiling.
[0028]
The hot water heated at a high temperature in the reheating heat exchanger 4 flows out to both sides of the inlet line 18 and the outlet line 23 of the reheating heat exchanger 4 by a convection phenomenon, and this reheating heat exchanger. The temperature of the hot water in the hot water supply passage 25 which is a communication passage communicating with the reheating circulation passage 24 and the reheating circulation passage 24 by the heat of the hot hot water flowing out from the hot water 4 is considerably high, for example, 70 to 80 ° C. To rise.
[0029]
As described above, the hot water temperature in the hot water filling passage 25 rises to a high temperature, so that a predetermined guaranteed temperature range of the water level sensor 28 (a water temperature range in which accurate water level detection is guaranteed (for example, 5 to 48). ))), The water level sensor 28 cannot detect the correct water pressure, and the sensor output of the water level sensor 28 changes the water level of the bathtub 22 as shown in FIG. In spite of this, it shifts in the direction of ascending or descending with a large temperature dependency.
[0030]
In addition, as described above, hot water heated at a high temperature in the reheating heat exchanger 4 flows out to both sides of the inlet line 18 and the outlet line 23 of the reheating heat exchanger 4, and the line 18 Then, convection in which warm hot water flows into the reheating heat exchanger 4 from both sides of the pipe line 23 is generated, and the convection of the hot water causes irregular vibrations in the reheating circulation passage 24 and the hot water passage 25. The irregular vibration of the hot water in the hot water passage 25 causes the sensor output of the water level sensor 28 to vibrate irregularly as shown in FIG.
[0031]
As described above, when the hot water in the reheating heat exchanger 4 is heated at a high temperature during the hot water supply single operation, the rise in the temperature of the hot water in the hot water filling passage 25 and irregular vibrations are synergistically involved, and the water level sensor 28. The sensor output fluctuates irregularly, and it is difficult to accurately detect the water level of the bathtub 22 based on the sensor output of the water level sensor 28.
[0032]
As described above, it is difficult to accurately detect the water level of the bathtub 22 due to the single operation of the hot water supply. For example, when the hot water supply interruption is performed during the operation in the water retention mode of the automatic operation, the single operation of the hot water supply is performed. When the output of the water level sensor 28 shifts upward, a water level higher than the water level of the bathtub 22 is detected, and the water holding operation is not performed even though the water level of the bathtub 22 is lower than the set water level. May malfunction. In addition, when the output of the water level sensor 28 is shifted downward, a water level lower than the water level of the bathtub 22 may be detected.
[0033]
The present invention has been made in order to solve the above-described problems, and its purpose is to provide a single can two water channel that can prevent the appliance from malfunctioning due to irregular fluctuations in the water level sensor output caused by hot water single operation. The purpose is to provide a bath water heater.
[0034]
[Means for Solving the Problems]
In order to achieve the above object, the present invention has the following configuration as means for solving the above problems. That is, the first invention is a hot water heat exchanger that heats water supplied from the water supply passage and sends it to the hot water supply passage, and is incorporated in the recirculation circulation passage of the bathtub hot water and circulates the hot water in the bathtub through the recirculation circulation passage. A circulation pump, a reheating heat exchanger that is installed in the recirculation circulation passage and recirculates the recirculation hot water circulating through the recirculation circulation passage by driving the circulation pump, and a hot water temperature provided in the recirculation circulation passage is detected. A recirculation circulation path temperature sensor, and a water level sensor that is disposed in the recirculation circulation path or a communication passage that communicates with the recirculation circulation path and detects the water level of the hot water in the bathtub by water pressure. The heat exchanger is integrated, and a common burner for heating the integrated hot water supply heat exchanger and the reheating heat exchanger is provided. In a single can / two water channel type bath water heater where the water level detection operation is performed by the sensor, the single water heater that monitors whether the single can / two water channel bath water heater performs a hot water supply only operation without a reheating operation. An operation monitoring unit; a pump drive unit that drives the circulation pump until a predetermined pump drive time elapses after the hot water supply single operation is stopped; and a water level detection operation by the water level sensor is stopped until the circulation pump is stopped after the hot water supply single operation. A means for solving the above problem is provided with a configuration in which a water level detection stop unit is provided.
[0035]
The second invention is a hot water heat exchanger that heats water supplied from the water supply passage and sends it to the hot water supply passage, and a circulation pump that is incorporated in the recirculation circulation passage of the bathtub hot water and circulates the bathtub hot water through the recirculation circulation passage. And a reheating heat exchanger that recirculates the circulating hot water that circulates in the recirculation circulation passage by driving the circulation pump, and a recuperation that detects the hot water temperature provided in the recirculation circulation passage. A circulation passage temperature sensor and a water level sensor that is disposed in the recirculation passage or the communication passage that communicates with the recirculation circulation passage and detects the water level of the hot water in the bathtub based on the water pressure; The unit is integrated, and a common burner for heating the integrated hot water supply heat exchanger and the reheating heat exchanger is provided, and the water level sensor is attached to the water level sensor at a predetermined timing. In a single can / two water channel type bath water heater where a water level detection operation is performed, a single hot water supply operation that monitors whether or not the single can / two water bath water heater performs a reheating operation without a reheating operation. A monitoring unit; during hot water supply single operation, when the hot water temperature detected by the recirculation circulation path temperature sensor is equal to or higher than a predetermined threshold temperature, it circulates until a predetermined pump drive time elapses after the hot water supply single operation is stopped A pump drive unit for driving the pump; and a water level detection stop unit for stopping the water level detection operation by the water level sensor until the circulation pump is stopped when the circulation pump is driven by the pump drive unit after the hot water supply single operation. The configuration serves as means for solving the above-described problems.
[0036]
According to a third aspect of the invention, in addition to the configuration of the first or second aspect of the invention, the pump drive time is based on the hot water temperature detected by the recirculation circulation passage temperature sensor during the hot water supply single operation or when the hot water supply single operation is stopped. A means for solving the above-mentioned problems is provided with a configuration in which a time setting unit for variably setting is provided.
[0037]
In the invention of the above configuration, for example, the hot water supply single operation monitoring unit monitors whether or not the single can two-channel bath water heater is performing the single hot water supply operation, or whenever the single hot water supply operation is performed, or the single hot water supply operation Only when the hot water temperature detected by the recirculation circulation path temperature sensor is equal to or higher than a predetermined threshold temperature, the pump drive unit turns the circulation pump on until a predetermined pump drive time elapses after the hot water supply single operation. Drive. The water level detection stop unit stops the water level detection operation by the water level sensor until the circulation pump is stopped when the circulation pump is driven by the pump driving unit after the hot water supply single operation.
[0038]
As described above, by driving the circulation pump after the hot water supply single operation, the hot water in the recirculation circulation passage starts to flow, and the hot water staying in the reheating heat exchanger heated to a high temperature by the hot water supply single operation and the recirculation circulation passage Remaining hot water in the communication passage communicating with the recirculation circulation passage flows out into the bathtub and the hot water in the recirculation circulation passage is replaced, and the water flowing through the reheating heat exchanger takes away the heat of the reheating heat exchanger. Cool the heat exchanger.
[0039]
For this reason, the hot water temperature at the position where the water level sensor is disposed decreases to the guaranteed temperature of the water level sensor in a short time after the hot water supply single operation, and the recirculation circulation passage or the like caused by the high temperature heating of the reheating heat exchanger Occurrence of irregular hot water vibration in the communication passage can be suppressed, and the sensor output of the water level sensor is stabilized in a short time.
[0040]
In the present invention, as described above, when the circulation pump is driven after the hot water supply single operation, the water level detection operation by the water level sensor is stopped. In other words, since the water level detection operation by the water level sensor is stopped until the sensor output of the water level sensor is stabilized by the circulation pump drive after the hot water supply individual operation, the sensor output of the water level sensor that fluctuates irregularly due to the single operation of hot water supply Based on this, it is avoided that an incorrect bathtub water level is detected, and an erroneous operation of the appliance operation due to an incorrect detection bathtub water level is prevented.
[0041]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0042]
The single can two-way bath water heater of the first embodiment has the system configuration shown in FIG. 3, and FIG. 1 shows a block configuration showing a characteristic control configuration in this embodiment by a solid line. Yes. Figure 3 Since the system configuration shown in FIG.
[0043]
As shown by the solid line in FIG. 1, the control device 40 that is characteristic in this embodiment includes a combustion operation control unit 43, a hot water supply single operation monitoring unit 44, a data storage unit 46, a water level detection stop unit 47, A pump drive unit 48 and a timer 51 are included.
[0044]
The combustion operation control unit 43 is preliminarily provided with sequence programs for various operation modes such as hot water supply and automatic operation. According to the sequence program, various sensor outputs, information from the remote controller 41, and the like are taken in and various operations are performed. Perform mode operation.
[0045]
The hot water supply independent operation monitoring unit 44 takes in information on the operation operation of the combustion operation control unit 43, and on the basis of this information, the hot water control valve 26 is in a closed state and the water flow sensor 36 is in a recirculation circulation path. When the water flow in the hot water supply passage 14 is not detected and the water amount sensor 31 detects the water flow in the hot water supply passage 14, it is detected that the hot water supply single operation is being performed. It detects that the operation is not performed and monitors whether the hot water supply single operation is performed.
[0046]
The water level detection stop unit 47 takes in the monitoring information of the hot water supply single operation monitoring unit 44 and, based on this information, detects that the single can two water bath hot water heater (appliance) has started the hot water supply single operation, It is determined that the sensor output of the water level sensor 28 may fluctuate irregularly due to the operation, and output of a water level detection stop command signal for stopping the water level detection operation by the water level sensor 28 is started. This command signal is output to the combustion operation control unit 43, and the combustion operation control unit 43 performs hot water supply interruption during operation in the operation mode involving the water level detection operation by the water level sensor 28 such as the hot water filling mode and the water retention mode. When the islanding operation is performed, the water level detection operation by the water level sensor 28 is stopped in response to the water level detection stop command signal.
[0047]
When the pump drive unit 48 detects that the single hot water supply operation has been completed based on the monitoring information of the single hot water supply operation monitoring unit 44, the pump drive unit 48 drives the circulation pump 20 to start circulation of hot water in the recirculation circulation passage 24 and a timer. 51 is reset and driven to start measuring the elapsed time after the hot water supply single operation is completed, and starts to take in the measurement time of the timer 51. At the same time, the pump drive unit 48 outputs a pump drive signal indicating that the circulation pump 20 is being driven to the water level detection stop unit 47.
[0048]
The water level detection stop unit 47 continuously outputs the water level detection stop command signal to the combustion operation control unit 43 upon receiving the pump drive signal from the pump drive unit 48 after the hot water supply single operation. With the continuous output of the water level detection stop command signal, the combustion operation control unit 43 continues the water level detection stop operation by the water level sensor 28.
[0049]
Then, the pump drive unit 48 reads a pump drive time tps (for example, 3 minutes) that is predetermined and stored in the data storage unit 46, compares the pump drive time tps with the measurement time of the timer 51, and When the measurement time of the timer 51 reaches the pump drive time tps, the drive of the circulation pump 20 is stopped, and at the same time, the output of the pump drive signal to the water level detection stop unit 47 is stopped.
[0050]
As described above, by driving the circulation pump 20 after the hot water supply single operation, hot water in the bathtub 22 enters the recirculation circulation path 24 and hot water remaining in the recirculation circulation path 24 flows out to the bathtub 22. The hot and cold water in the recirculation circulation passage 24 is replaced. Moreover, since the heat of the reheating heat exchanger 4 heated to a high temperature due to the hot water supply single operation is taken away by the recirculation passage 24 and flows out to the bathtub 22, the reheating heat exchanger 4 is cooled. The
[0051]
Thus, by driving the circulation pump 20 after the hot water supply single operation, the time required for the hot water in the recirculation circulation passage 24 to be replaced and the reheating heat exchanger 4 to be cooled is obtained by experiments, calculations, and the like. The obtained time is stored in the data storage unit 46 as the pump drive time tps, and as described above, the circulating pump 20 is driven until the pump drive time tps elapses after the hot water supply single operation. The hot and cold water of 24 can be reliably replaced, and the reheating heat exchanger 4 can be cooled.
[0052]
For this reason, when the driving of the circulation pump 20 is stopped after the hot water supply single operation, the hot water temperature at the position where the water level sensor 28 is disposed is lowered to the guaranteed temperature of the water level sensor 28, and the hot water vibration of the reheating heat exchanger 4 is caused. The state is suppressed, and the sensor output of the water level sensor 28 is stable.
[0053]
The water level detection stop unit 47 is a sensor of the water level sensor 28 when the pump drive unit 48 stops outputting the pump drive signal, that is, when the pump drive unit 48 stops driving the circulation pump 20. It is determined that the output is stable and an accurate bath water level can be detected based on the sensor output of the water level sensor 28, and the output of the water level detection stop command signal to the combustion operation control unit 43 is stopped. The combustion operation control unit 43 can perform the water level detection operation by the water level sensor 28.
[0054]
The pump driving unit 48 may stop / reset the driving of the timer 51 when stopping the driving of the circulation pump 20 to prepare for the next timer driving, or stop / reset every time the hot water supply independent operation stops. -You may drive in order.
[0055]
According to this embodiment, since the hot water supply single operation monitoring unit 44 and the pump drive unit 48 are provided, the circulating pump 20 is driven until a predetermined pump drive time tps elapses after the hot water supply single operation is completed. be able to. Thus, by driving the circulation pump 20 after the hot water supply single operation, the hot water staying in the recirculation circulation passage 24 or the hot water filling passage 25 is caused to flow out from the recirculation circulation passage 24 or the hot water filling passage 25. The hot water temperature at the position where the water level sensor 28 is disposed can be lowered to the guaranteed temperature of the water level sensor 28 in a short time.
[0056]
In addition, the water flowing through the reheating heat exchanger 4 by driving the circulation pump 20 takes away the amount of heat held by the reheating heat exchanger 4 heated to a high temperature by the hot water supply single operation and flows out from the recirculation circulation passage 24. Therefore, the reheating heat exchanger 4 can be forcibly cooled, and the convective irregular vibration of the reheating heat exchanger 4 caused by the high temperature heating of the reheating heat exchanger 4 can be suppressed in a very short time. be able to.
[0057]
In this way, by driving the circulation pump 20 after the hot water supply single operation, the sensor of the water level sensor 28 due to the synergistic contribution of the temperature dependence of the water level sensor 28 and the occurrence of the convection phenomenon of hot water in the reheating heat exchanger 4. Irregular fluctuations in output can be suppressed in a short time, and the sensor output of the water level sensor 28 can be stabilized.
[0058]
In addition, since the water level detection stop unit 47 is provided and the water level detection operation by the water level sensor 28 is stopped during a single hot water supply operation and until a predetermined pump drive time tps elapses after the single hot water supply operation, During the period when the sensor output fluctuates irregularly due to the hot water supply single operation, the water level detection operation by the water level sensor 28 can be stopped, and an incorrect bath water level is detected due to the irregular fluctuation of the sensor output of the water level sensor 28. And the problem that the appliance malfunctions based on an inaccurate bathtub water level can be reliably avoided.
[0059]
Further, as described above, by driving the circulation pump 20 after the hot water supply single operation, the sensor output of the water level sensor 28 can be stabilized in a short time. Therefore, the time during which the water level detection operation is stopped after the hot water supply single operation is performed. Is short.
[0060]
The second embodiment will be described below. What is characteristic in this embodiment is that a pump drive determination unit 52 shown by a chain line in FIG. 1 is provided, and the hot water temperature detected by the bath temperature sensor 37 during the hot water supply single operation is equal to or higher than a predetermined threshold temperature Ts. Only when the pump drive determination unit 52 determines that it has become, the configuration is such that the circulation pump 20 is driven after the hot water supply single operation. The configuration other than the data storage unit 46, the pump drive unit 48, and the pump drive determination unit 52 is the same as that of the first embodiment, and the description of the common parts is omitted.
[0061]
By the way, there is a case where the hot water supply single operation ends immediately after the hot water supply single operation is started. In this case, since the burning time of the burner 2 is very short, the hot water in the reheating heat exchanger 4 does not reach a high temperature. From this, the reheating heat exchanger 4 caused by the hot water convection phenomenon Since the hot water temperature at the position where the water level sensor 28 is disposed does not exceed the guaranteed temperature of the water level sensor 28, the sensor output of the water level sensor 28 does not fluctuate irregularly.
[0062]
In such a case, a stable sensor output of the water level sensor 28 can be obtained without driving the circulation pump 20 after the hot water supply single operation. Accordingly, in this embodiment, the hot water temperature detected by the bath temperature sensor 37 is taken in as the hot water temperature at the position where the water level sensor 28 is disposed, and the hot water temperature detected by the bath temperature sensor 37 during the hot water supply single operation is the water level sensor 28. Only when the temperature is higher than the guaranteed temperature, the circulation pump 20 is driven after the single hot water supply operation, and the circulation pump 20 is not driven after the other single hot water supply operations.
[0063]
This is because the location of the bath temperature sensor 37 is close to the location of the water level sensor 28, and the detected hot water temperature of the bath temperature sensor 37 is considered to be substantially equal to the hot water temperature of the location of the water level sensor 28. When the detected hot water temperature of the bath temperature sensor 37 (the hot water temperature at the position where the water level sensor 28 is disposed) is equal to or higher than the guaranteed temperature of the water level sensor 28, the sensor output of the water level sensor 28 shifts with a large temperature dependence as described above. At the same time, since the hot water temperature of the reheating heat exchanger 4 is very high and hot water vibration caused by hot water convection phenomenon occurs, the sensor output of the water level sensor 28 is considered to fluctuate irregularly. When the detected hot water temperature 37 is equal to or higher than the guaranteed temperature of the water level sensor 28, the hot water supply alone is operated to drive the circulation pump 20 and replace the hot water in the circulation passage 24. The fired heat exchanger 4 follow cooled, stabilizing the sensor output of the water level sensor 28.
[0064]
In other cases, that is, when the detected hot water temperature of the bath temperature sensor 37 is not higher than the guaranteed temperature during the hot water supply single operation, a stable sensor output of the water level sensor 28 can be obtained without driving the circulation pump 20. Therefore, the circulation pump 20 is not driven after the hot water supply single operation.
[0065]
The data storage unit 46 stores a pump driving time tps and a predetermined threshold temperature Ts (for example, 48 ° C.). This threshold temperature Ts is determined based on the guaranteed temperature of the water level sensor 28. In this embodiment, the upper limit value of the guaranteed temperature of the water level sensor 28 is stored in the data storage unit 46 as the threshold temperature Ts. ing.
[0066]
The pump drive determination unit 52 takes in the monitoring information of the hot water supply independent operation monitoring unit 44, and starts to take in the hot and cold water temperature detected by the bath temperature sensor 37 when detecting that the hot water supply independent operation is started based on the monitoring information. At the same time, the threshold temperature Ts is read from the data storage unit 46.
[0067]
The pump drive determination unit 52 incorporates a timer (not shown), takes in the detected hot water temperature of the bath temperature sensor 37 at a predetermined sampling time interval, and detects the detected hot water temperature of the bath temperature sensor 37 and the threshold temperature Ts. (In other words, the upper limit value of the guaranteed temperature of the water level sensor 28) is compared, and when it is determined that the detected hot water temperature of the bath temperature sensor 37 is equal to or higher than the threshold temperature Ts, the chasing is due to the hot water supply single operation. In order to stabilize the sensor output of the water level sensor 28 in a short time after the hot water single operation, it is determined that the hot water temperature of the water heat exchanger 4 is heated to a high temperature and the sensor output of the water level sensor 28 fluctuates irregularly. The hot water in the recirculation circulation passage 24 is replaced by driving the recirculation passage 24, and it is determined that the reheating heat exchanger 4 needs to be cooled. Outputs a pump drive command signals for causing the pump drive unit 48.
[0068]
The pump drive unit 48 starts driving the circulation pump 20 after the hot water supply single operation only when the pump drive command signal is received from the pump drive determination unit 52 during the single hot water supply operation.
[0069]
In this embodiment, when the circulating pump 20 is not driven by the pump drive unit 48 after the hot water supply single operation, the water level detection stop unit 47 does not receive the pump drive signal from the pump drive unit 48 after the hot water supply single operation. When the hot water supply single operation is completed, the output of the water level detection stop command signal to the combustion operation control unit 43 is stopped, and the combustion operation control unit 43 ends the water level detection stop operation.
[0070]
According to this embodiment, the pump drive determination unit 52 is provided, and the hot water supply single operation is performed only when the detected hot water temperature detected by the bath temperature sensor 37 during the hot water supply single operation is equal to or higher than a predetermined threshold temperature Ts. Since the pump pump 48 is used to drive the circulation pump 20 later, the circulation pump 20 is driven after the hot water supply single operation only when the sensor output of the water level sensor fluctuates irregularly due to the hot water supply single operation. Can be performed. Thus, although the sensor output of the stable water level sensor 28 can be obtained, it is possible to eliminate the waste of the instrument operation that the circulation pump 20 is driven after the hot water supply single operation.
[0071]
The third embodiment will be described below. What is characteristic in this embodiment is that a time setting unit 50 is provided as shown by the dotted line in FIG. 1, and the pump driving time tps of the data storage unit 46 is variably set by the time setting unit 50. It is. Configurations other than the data storage unit 46 and the time setting unit 50 are the same as those in each of the embodiments described above, and redundant description thereof is omitted.
[0072]
The data storage unit 46 stores pump drive setting data. The pump drive setting data is provided with a pump drive time corresponding to the hot water temperature detected by the bath temperature sensor 37. As shown in (a) and (b) of FIG. As the detected hot water temperature increases, the pump drive time is given to increase continuously or stepwise.
[0073]
This is because as the amount of retained heat given to the reheating heat exchanger 4 by the hot water supply single operation increases, the hot water temperature of the reheating heat exchanger 4 increases, and the hot water of the reheating heat exchanger 4 increases. The hot water in the recirculation passage 24 is heated by the heat, and the hot water temperature detected by the bath temperature sensor 37 increases. Thus, the detected hot water temperature of the bath temperature sensor 37 corresponds to the amount of heat held by the reheating heat exchanger 4, and as the detected hot water temperature of the bath temperature sensor 37 becomes higher, that is, the reheating heat exchanger 4 has a higher temperature. As the amount of retained heat increases, more time is required until the reheating heat exchanger 4 is cooled by driving the circulation pump 20 after the hot water supply single operation. Therefore, in this embodiment, the pump drive time tps is variably set as the detected hot water temperature of the bath temperature sensor 37 increases.
[0074]
The time setting unit 50 takes in the monitoring information of the hot water supply independent operation monitoring unit 44, and takes in the hot water temperature detected by the bath temperature sensor 37 when it detects that the hot water supply independent operation has ended based on this monitoring information. The pump driving setting data is read from the storage unit 46, and the pump driving time is set by comparing the hot water temperature detected by the bath temperature sensor 37 with the pump driving setting data.
[0075]
The set pump drive time is overwritten with the pump drive time tps stored in the data storage unit 46, and the pump drive unit 48 can supply only the hot water supply when the circulating pump 20 is driven after the hot water supply single operation. The circulation pump 20 is driven until the set pump drive time tps elapses after the operation ends.
[0076]
According to this embodiment, the time setting unit 50 is provided so that the pump drive time tps is variably set based on the hot water temperature detected by the bath temperature sensor 37. Therefore, the sensor output of the water level sensor 28 is Stability The pump drive time tps can be more accurately matched to the drive time of the circulation pump 20 required to reduce the pressure. For example, since the pump drive time tps is fixedly set to a long time, the sensor output of the water level sensor 28 is stabilized. Even after the circulation of hot water required for this is completed, the circulation pump 20 is driven unnecessarily, and conversely, the pump drive time tps is set to a short fixed time, so that the sensor output of the water level sensor 28 is stable. Before the circulation of the hot water necessary for the operation is completed, the driving of the circulation pump 20 is stopped. For example, the accumulated hot water in the reheating heat exchanger 4 is boiled and the retained hot water becomes high temperature. Thus, it is possible to reliably avoid such a problem that the sensor output starts to fluctuate irregularly, an incorrect bath water level is detected, and the appliance malfunctions.
[0077]
Note that, as described above, the time until the sensor output of the water level sensor 28 is stabilized after the hot water supply single operation corresponds to the amount of retained heat given to the reheating heat exchanger 4 by the hot water supply single operation. The variation range of the retained heat amount of the soaking heat exchanger 4 is determined in advance, and the range of the retained heat amount is narrow. Therefore, the variation range of the pump drive time required for the sensor output of the water level sensor 28 to stabilize after the hot water supply single operation is short. Therefore, even if the pump drive time tsp is fixed to a time within the range of the pump drive time, the pump drive time tps does not deviate greatly from the time until the sensor output of the water level sensor 28 is stabilized. Such problems can be almost avoided.
[0078]
The present invention is not limited to the above embodiments, and various embodiments can be adopted. For example, in the second and third embodiments, the threshold temperature Ts is set to the upper limit value of the guaranteed temperature of the water level sensor 28, but the threshold temperature Ts is the upper limit value of the sensor output of the water level sensor 28. The hot water temperature detected by the bath temperature sensor 37 can determine whether the hot water temperature at the position where the water level sensor 28 is disposed is equal to or higher than the guaranteed temperature and whether hot water vibration is occurring. Is set based on
[0079]
In the third embodiment, the pump drive setting data is stored in the data format of the graph data as shown in FIG. 2, but the pump drive is set according to the detected hot water temperature of the bath temperature sensor 37. Pump drive setting data is configured in a data format other than graph data, such as table data given time, arithmetic expression data for obtaining pump drive time using the detected hot water temperature of the bath temperature sensor 37 as a parameter, and the data storage unit 46 It may be stored.
[0080]
Further, in each of the above embodiments, the water level detection stop unit 47 stops the water level detection operation by the water level sensor 28 over the entire period in which the hot water supply single operation is performed. The water level detection operation by the water level sensor 28 may be stopped only during a part of the period during which the water level is determined.
[0081]
For example, a stop threshold temperature Tst for determining stoppage of the water level detection operation by the water level sensor 28 (for example, an upper limit value of the guaranteed temperature of the water level sensor 28) is determined in advance, and the water level detection stop unit 47 is operated during hot water supply single operation. When the detected temperature detected by the bath temperature sensor 37 is compared with the stop threshold temperature Tst and it is determined that the detected temperature of the bath temperature sensor 37 is equal to or higher than the stop threshold temperature Tst, the sensor output of the water level sensor 28 is output. Starts to fluctuate irregularly, and it is determined that there is a possibility that the instrument may malfunction due to irregular fluctuations in the sensor output of the water level sensor 28, and the water level detection operation by the water level sensor 28 is continued until the hot water supply independent operation is completed. Or you may make it stop until the drive of the circulation pump 20 stops after hot water supply independent operation.
[0082]
Further, the time period from when the hot water supply single operation is started to when the reheating heat exchanger 4 is heated by the combustion of the burner 2 and the sensor output of the water level sensor 28 is considered to start to fluctuate irregularly is obtained by time. The obtained time is set in advance as a threshold time tst, and the water level detection stopping unit 47 determines that the sensor output of the water level sensor 28 is not output when the above threshold time tst has elapsed since the start of a single hot water supply operation. It begins to fluctuate regularly, it is determined that there is a possibility that the appliance may malfunction due to irregular fluctuations in the sensor output of the water level sensor 28, and the water level detection operation by the water level sensor 28 is terminated until the hot water supply single operation ends, or Further, it may be stopped until the driving of the circulation pump 20 is stopped after the hot water supply single operation.
[0083]
Further, the water level detection stop unit 47 does not perform the water level detection stop operation during the hot water supply single operation, and when the circulation pump 20 is driven after the hot water supply single operation, only the period until the drive of the circulation pump 20 is stopped, The water level detection operation by the water level sensor 28 may be stopped.
[0084]
Further, the pump drive determination unit 52 shown in each of the above embodiments determines whether or not to drive the circulation pump 20 after the hot water supply single operation based on the hot water temperature detected by the bath temperature sensor 37. In addition, a temperature sensor separate from the bath temperature sensor 37 is provided in the recirculation circulation passage 24 or the hot water filling passage 25 in the vicinity of the position where the water level sensor 28 is disposed, and the hot water supply single operation is performed based on the hot water temperature detected by the temperature sensor. It may be determined whether or not the circulation pump 20 is driven later.
[0085]
Further, in the third embodiment, the time setting unit 50 takes in the hot water temperature detected by the bath temperature sensor 37 when the hot water supply independent operation is completed and sets the pump drive time. The pump drive time may be set based on the detected hot water temperature of the bath temperature sensor 37 taken in. For example, the hot water temperature detected by the bath temperature sensor 37 during the hot water supply single operation is taken in every moment, and when the hot water single operation ends, the pump drive time is set based on the detected hot water temperature of the bath temperature sensor 37 immediately before the hot water single operation ends. It may be set.
[0086]
Further, in each of the above embodiments, the case where the hot water supply single operation is performed during the automatic operation has been described as an example. However, the present invention is also applied to the case where the hot water supply single operation is performed during the operation mode other than the automatic operation. It is possible.
[0087]
Further, each of the above embodiments has been described by taking the appliance shown in FIG. 3 as an example. However, the present invention is a one-can two-water channel type bath water heater, and a circulation pump and a recirculation circulation passage temperature sensor are provided in the recirculation circulation passage. If the water level sensor that detects the water level of the bathtub by water pressure is provided in the recirculation passage or the communication passage that communicates with the recirculation circulation passage, one can two of the system configurations other than FIG. It can also be applied to a waterway bath water heater. For example, the present invention can also be applied to a single can two water bath hot water heater in which the hot water filling passage 25 shown in FIG. 3 is omitted and the water level sensor 28 is disposed in the recirculation circulation passage 24. Also in this case, similarly to the above embodiments, the circulating pump 20 is driven after the hot water supply single operation and the water level detection operation is stopped, so that the staying hot water of the reheating heat exchanger 4 by the hot water supply single operation is stopped. It is possible to prevent malfunction of the instrument due to irregular fluctuations in the sensor output of the water level sensor 28 due to high temperature heating.
[0088]
【The invention's effect】
According to this invention, since the hot water supply single operation monitoring unit and the pump drive unit are provided, the circulation pump can be driven until a predetermined pump drive time elapses after the hot water supply single operation is completed. Thus, after the hot water supply single operation, by driving the circulation pump, the hot water of the reheating heat exchanger heated to a high temperature by the single operation of hot water supply, the hot water of the recirculation circulation passage or the communication passage can be discharged to the bathtub. The hot water temperature at the position where the water level sensor is disposed can be lowered to the guaranteed temperature of the water level sensor in a short time.
[0089]
In addition, the water flowing through the reheating heat exchanger by driving the circulation pump removes the heat of the reheating heat exchanger and flows out of the recirculation circulation passage, so that the reheating heat exchanger is forcibly cooled. It is possible to suppress the hot water vibration caused by the high temperature heating of the reheating heat exchanger in a short time.
[0090]
From these things, the sensor output of a water level sensor can be stabilized in a short time after hot water supply independent operation.
[0091]
In addition, a water level detection stop unit is provided to stop the water level detection operation by the water level sensor until the circulating pump stops driving after the hot water supply single operation, so the water level detection is performed during the period when the water level sensor fluctuates irregularly due to the hot water supply single operation. The operation can be stopped, and the water level sensor's irregularly changing sensor output can prevent the incorrect bath water level from being detected, causing the appliance to malfunction based on the incorrect bath water level. Can be prevented.
[0092]
Only when the hot water temperature detected by the recirculation circulation path temperature sensor is equal to or higher than a predetermined threshold temperature during the hot water supply single operation, the hot water supply single operation Only when it is determined that the sensor output of the water level sensor fluctuates irregularly due to the water pump, the circulating pump is driven after the hot water supply single operation. Is obtained, it is not necessary to drive the circulation pump after the hot water supply single operation, and therefore it is possible to omit useless operation of the circulation pump.
[0093]
In the invention provided with the time setting unit for variably setting the pump driving time, the pump driving time can be variably set according to the detected hot water temperature of the recirculation circulation path temperature sensor. It can be adjusted more accurately during the period until the sensor output of the water level sensor is stabilized by the subsequent circulation pump.
[0094]
As a result, the following problems can be avoided. For example, because the pump drive time is set to a long and constant time, it takes time for the pump drive time to end after the time required for the sensor output of the water level sensor to stabilize after hot water supply single operation, On the contrary, because the pump drive time is set to a short fixed time, the pump drive time ends before the reheating heat exchanger is cooled, and the water flow in the recirculation circulation passage is stopped and replenished. Hot water in the reheating heat exchanger is heated due to post-boiling in the hot water in the soaking heat exchanger, the sensor output of the water level sensor starts to fluctuate irregularly, and the equipment malfunctions due to irregular fluctuation in the sensor output of the water level sensor However, as described above, the pump drive time should be variably set so as to match the period until the sensor output of the water level sensor stabilizes after hot water supply single operation. More, it is possible to reliably avoid a malfunction of the waste and the instrument of the instrument operation as described above.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an embodiment of a single can / two water bath hot water heater according to the present invention.
FIG. 2 is a graph showing an example of pump drive setting data in which a pump drive time is given corresponding to a detected hot water temperature in a recirculation circulation passage.
FIG. 3 is an explanatory diagram showing a system configuration example of a single can / two water bath hot water heater.
FIG. 4 is a flowchart showing an example of an automatic driving operation.
FIG. 5 is a graph showing an example of PQ data indicating the relationship between the sensor output of the water level sensor and the amount of bathtub water.
FIG. 6 is an explanatory diagram showing a conventional problem.
[Explanation of symbols]
2 Burner
3 Hot water supply heat exchanger
4 Reheating heat exchanger
13 Water supply passage
14 Hot water passage
24 Recirculation passage
25 Hot water passage
28 Water level sensor
37 Bath temperature sensor
44 Hot water supply independent operation monitoring section
46 Data storage
47 Water level detection stop
48 Pump drive
50 hours setting section

Claims (3)

A hot water supply heat exchanger that heats water supplied from the water supply passage and sends it to the hot water supply passage, a circulation pump that is incorporated in the recirculation circulation passage of the bathtub hot water, and recirculates the bathtub hot water through the circulation passage, and a recirculation circulation passage A reheating heat exchanger for recirculating hot water circulating through the recirculation circulation passage by driving the circulation pump, a recirculation circulation passage temperature sensor for detecting a hot water temperature provided in the recirculation circulation passage, A water level sensor that is disposed in a recirculation passage or a communication passage that communicates with the recirculation circulation passage and detects the water level of the hot water in the bathtub by water pressure, and the hot water supply heat exchanger and the reheating heat exchanger are integrated, A common burner for heating the integrated hot water supply heat exchanger and the reheating heat exchanger is provided, and the water level detection operation by the water level sensor at a predetermined timing. In the canned and two-fluid type bath water heater in which hot water supply is operated, a single hot water supply independent operation monitoring unit that monitors whether or not the canned and two-fluidic bath water heater performs the hot water supply alone operation without performing the reheating operation; A pump drive unit that drives the circulation pump until a predetermined pump drive time elapses after the hot water supply single operation is stopped; a water level detection stop unit that stops the water level detection operation by the water level sensor until the circulation pump stops after the hot water supply single operation; One can two water bath hot water heater characterized by having provided; A hot water supply heat exchanger that heats water supplied from the water supply passage and sends it to the hot water supply passage, a circulation pump that is incorporated in the recirculation circulation passage of the bathtub hot water, and recirculates the bathtub hot water through the circulation passage, and a recirculation circulation passage A reheating heat exchanger for recirculating hot water circulating through the recirculation circulation passage by driving the circulation pump, a recirculation circulation passage temperature sensor for detecting a hot water temperature provided in the recirculation circulation passage, A water level sensor that is disposed in a recirculation passage or a communication passage that communicates with the recirculation circulation passage and detects the water level of the hot water in the bathtub by water pressure, and the hot water supply heat exchanger and the reheating heat exchanger are integrated, A common burner for heating the integrated hot water supply heat exchanger and the reheating heat exchanger is provided, and the water level detection operation by the water level sensor at a predetermined timing. In the canned and two-fluid type bath water heater in which hot water supply is operated, a single hot water supply independent operation monitoring unit that monitors whether or not the canned and two-fluidic bath water heater performs the hot water supply alone operation without performing the reheating operation; When the hot water temperature detected by the recirculation passage temperature sensor exceeds the predetermined threshold temperature during the hot water single operation, the circulating pump is driven until a predetermined pump drive time elapses after the hot water single operation is stopped. And a water level detection stop unit that stops the water level detection operation by the water level sensor until the circulation pump stops when the circulation pump is driven by the pump drive unit after the hot water supply single operation. One can two water bath hot water heater. 2. A time setting unit that variably sets a pump drive time based on a hot water temperature detected by a recirculation circulation path temperature sensor during hot water supply single operation or when hot water supply single operation is stopped is provided. Item 1. A can of two water bath hot water heater.

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